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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 957 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.39² =
  2. 2.79² =
  3. 3.61² =
  4. 4.41² =
  5. 5.81² =
  6. 6.71² =
  7. 7.19² =
  8. 8.69² =
  9. 9.29² =
  10. 10.21² =
  11. 11.19² =
  12. 12.21² =
  13. 13.59² =
  14. 14.39² =
  15. 15.21² =
  16. 16.71² =
  17. 17.79² =
  18. 18.21² =
  19. 19.81² =
  20. 20.39² =
  21. 21.71² =
  22. 22.21² =
  23. 23.41² =
  24. 24.19² =
  25. 25.91² =
  26. 26.49² =
  27. 27.89² =
  28. 28.89² =
  29. 29.21² =
  30. 30.71² =
  31. 31.29² =
  32. 32.59² =
  33. 33.59² =
  34. 34.51² =
  35. 35.81² =
  36. 36.61² =
  37. 37.29² =
  38. 38.61² =
  39. 39.31² =
  40. 40.69² =

Answer key

  1. 1521
  2. 6241
  3. 3721
  4. 1681
  5. 6561
  6. 5041
  7. 361
  8. 4761
  9. 841
  10. 441
  11. 361
  12. 441
  13. 3481
  14. 1521
  15. 441
  16. 5041
  17. 6241
  18. 441
  19. 6561
  20. 1521
  21. 5041
  22. 441
  23. 1681
  24. 361
  25. 8281
  26. 2401
  27. 7921
  28. 7921
  29. 441
  30. 5041
  31. 841
  32. 3481
  33. 3481
  34. 2601
  35. 6561
  36. 3721
  37. 841
  38. 3721
  39. 961
  40. 4761

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